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- W2316021584 abstract "A 3-D Quaternary mapping project conducted by the Ontario Geological Survey (OGS)in the southern part of Simcoe County involves borehole drilling, airborne geophysics, such asTDEM and magnetics and ground gravity surveys. Geophysical surveys are necessary to definethe top of bedrock, including buried bedrock valleys and the architecture of overlying sedimentsfor evaluating groundwater resources. In support of this project, the Geological Survey ofCanada (GSC) carried out a three-line 21.2 km seismic reflection survey. Geophysical loggingin two deep boreholes was undertaken to assist with the calibration of the seismic sections.The seismic survey was performed using an IVI “Minivib 1” source with a“landstreamer” three-component geophone array built by the GSC. The landstreamer consists of72 - 3 kg metal sleds, spaced at 1.5 m, towed using low-stretch belts. Data were acquired withshot points every 4.5 m. The source vibrates a 140 kg mass in in-line (H1) horizontal mode,using a 7 second nonlinear logarithmic sweep of -2 DB/Oct from 20 to 300 Hz. This type ofsweep increases the time spent in the low end of the sweep which has the effect to increase thelow frequency energy to enhance shear body wave energy. Data were recorded using seven 24-channel Geometrics Geode engineering seismographs operated in the cab of the Minivib. Onlythe vertical component of the 24 geophones, furthest from the source, was recorded in order toobtain a better coverage of the P-wave data acquisition window. Uncorrelated records werecollected to allow pre-whitening of the data and careful choice of the correlating function wasthe first step in the data processing sequence. P-wave sections were derived from processing thefirst 0.5 sec. (after correlation) of data acquired on the vertical geophones, while S-wave sectionswere produced using the in-line, H1, component over a correlated window of 2 seconds. Seismicsections were then correlated with borehole geophysical data.Interpretation of the equivalent compressional (P-) wave section permits delineation ofseismic facies sequences. The P-wave velocity is an order of magnitude higher than the shearwavevelocity and as a result, the vertical resolution of the section is lower. However, theacoustic impedance contrast with underlying materials (coarser sediments, tills or bedrock) islower than in the case of shear-wave. The shear-wave data produce remarkably detailed sectionsover buried valleys down to 150 m." @default.
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- W2316021584 date "2015-03-26" @default.
- W2316021584 modified "2023-09-24" @default.
- W2316021584 title "MULTICOMPONENT VIBROSEISMIC PROFILING OVER HIGH VELOCITY GLACIAL GROUND: AN EXAMPLE FROM SOUTHERN ONTARIO" @default.
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- W2316021584 doi "https://doi.org/10.4133/sageep.28-069" @default.
- W2316021584 hasPublicationYear "2015" @default.
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